Sewing machine bed



Feb. 15, 1944. CHASON 2,341,975

SEWING MACHINE BED Filed June 8, 1942 3 Sheets-Sheet l WWW I /;WFW

Feb. 15, 1944. D. H. CHASON ,3

SEWING MACHINE BED Filed June 8, 1942 5 Sheets-Sheet 2 gnoewfot DanielliChason Feb. 15, 1944. D. H. CHASON SEWING MACHINE BED Filed June 8, 19423 Sheets-Sheet 6 Daniel H Chaabn Patented Feb. 15, 1944 2,341,975 SEWINGMACHINE BED Daniel H. Chason, Elizabeth, N. J., assignor to The SingerManufacturing Company, Elizabeth, N. .L, a corporation of New JerseyApplication June 8, 1942, Serial No. 446,179

8 Claims This invention relates to sewing machines and more particularlyto sewing machines of the portable type and has for its primary objectto produce a sewing machine which is light in weight.

Another object of the present invention is to provide such a machinewith a bed which will be not only light in weight but exceedingly rigidand inexpensive to manufacture.

A further object of the invention is to provide a sewing machine bedhaving a. receptacle portion which may be constructed of sheet-metal,plastic .or equivalent light weight materials.

With the above and other objects in view, as will hereinafter appear,the invention comprises the devices, combinations and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the invention, from which the severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

The invention, both in structure and in opera tion, as well asadditional objects thereof, will be best understood from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

Fig. 1 is a perspective view from the back side of a. sewing machineincorporating the present invention.

Fig. 2 is a bottom plan view of the' machine'with the bottomclosure-plate removed.

Fig. 3 is a vertical section taken longitudinally through the bedportion of the machine.

Fig. 4 is a top plan view of the bed-frame.

Fig. 5 is a side elevation of the bed-frame shown in Fig. 4.

Fig. 6 is a left-hand end elevation of the bedframe shown in Fig. 5.

Fig. 7 is a right-hand end elevation of the bed frame shown in Fig. 5.

Fig. 8 is a top plan view of a portion of the machine cloth-plate at thework-feeding end thereof.

Fig. 9 is a right-hand end elevation of the machine shown in Fig. 3.

Fig. 10 is a perspective view of the cloth-plate y of the machine.

Fig. 11 is a perspective view of the platform member of the machine.

Fig. 12 is a perspective view of the right-hand end-wall shown in Fig.3.

Fig. 13 is a perspective view of the left-hand end-wall shown in Fig. 3.

Fig. 14 is a perspective view of the bottom closure-plate shown in Fig.3.

For the purposes of the present disclosure the invention is described asembodied in a preferred form in a sewing machine having an uprightstandard i5 which carries the overhanging bracket-arm l6 terminating ina hollow head ll. J ournaled for endwise movement in the head i! are theusual reciprocatory needle-bar l8 and presser-bar l9. Suitably mountedupon one end of the bracket-arm is the usual balance-wheel 20 drivenfrom a motor 2| by a belt 22. Disposed within the standard I5 is theusual actuating mechanisin comprising the feed-actuating pitmans 23 and24, and the rotary shaft 25 carrying the bevel gear 26 at its lower end.

For a more detailed description of the actuating mechanism disposedwithin the standard and the bracket-arm, reference may be had to the U.S. patent to H. J. Goosman, No. 2,063,841, dated Dec. 8, 1936.

Supporting the upright standard I5 is a chambered bed portion comprisinga cloth-plate 21 having side-walls, 28 and 29 depending therefrom.End-walls 30 and 3|, having lips 32, are secured to the end portions ofthe cloth-plate and the side-walls by welding or suitably fastening thelips 32 to the inner portions of the cloth-plate and side-walls. Thedepending side-walls 28 and 29 and the depending end-walls 30 and 3|form with the cloth-plate 21 a substantially rectangular shapedreceptacle or enclosure.

Tongues 33 are formed on the bottom edges of the side-and end-Walls ofthe cloth-plate; said tongues entering slots 34 provided in a platformmember 35. Also formed on the side walls 28 and 29 are verticallyapertured brackets 36, of which the apertures 31 are aligned withvertical apertures 38 provided in the platform member 35. Bolts 39 arereceived in these apertures, and nuts 40 are threaded on the bolts forthe purpose of securing the platform member 35 to the chambered bed orreceptacle portion comprising the above described cloth-plate.

In the preferred form of this bed portion, the cloth-plate and itsdepending walls are constructed from a thin sheet-metal, but it isobvious that it could be constructed from divers other materialsincluding a molded plastic substance.

In order to give the bed portion the proper degree of rigidity, asubstantially rectangular shaped skeletonframe member M is providedwithin the chambered bed portion. Upon each of the two end portions ofthis frame member 4| are formed bearing-elements in the form of bosses42 which snugly enter apertures 43 provided in the respective end-walls36 and 3|. The top portion of the frame 4| has a grid structurecomprising a plurality of web-elements 44 which are engaged by thebottom surface of the clothplate 21 in a plurality of spaced areasthereof, for the purpose of supporting the same against downwarddeflection.

A raised and substantially circular shaped portion 45 of the frame 4| isprovided with apertures 46 and is adapted to enter a raised or flangedboss 41 of the cloth-plate 21, so that the apertures 46 are verticallyaligned with apertures 46 provided in the flanged. boss. The armstandard|5 is adapted to be supported directly upon the flanged boss 41 of thecloth-plate and to be secured to the raised portion 45 of the frame bymeans of bolts 49 which pass through the aligned apertures 46 and 46. Asmay be best seen in Figs. 4 and respectively, the raised frame portion45 and the flanged cloth-plate boss 41 are apertured so that the abovedescribed rotary shaft 25 and the pitmans 23 and 24 may extenddownwardly into the chambered bed.

The bevel-gear 26 is in mesh with a bevel-gear 50 carried by aloop-taker actuating shaft 5| journaled in bearing-lugs 52 which areprovided on both ends of the frame 4|. As may be best seen in Fig. 2,the forward end of the looperactuating shaft 5| extends through andbeyond an opening 53 provided in the end-wall 3|. A loop-taker 54 ismounted upon the forward end of the shaft 5 I. Rotation of the shaft 25,through the medium of gears 26 and 50, actuates the shaft 5| which inturn operates the loop-taker 54.

Also disposed within the chambered bed are rock-shafts 55 and 56 whichimpart to a feedbar 57, carrying the usual feed-dog, the conventionalfeed-lift and feed-advance movements. The rock-shafts 55 and 56 aresupported on the pivot-pintles 58 carried by the bearing bosses 42formed in the frame 4|. The rock-shafts 55 and 56 are actuated by thepitmans 24 and 23, respectively, the pitmans receiving their motion fromthe usual feed-actuating mechanisms not shown herein. For a betterunderstanding of the looper-actuating and feeding mechanisms, referencemay be had to Patent No. 2,063,841, hereinbefore mentioned.

In the forward end portion of the frame 4| is I provided a raisedsegmental'throat-plate supporting rib 59 disposed in the throat-plateclearance opening 60 provided in the cloth-plate 21. A slotted andsuitably apertured throat-plate 6| is secured directly to the raised rib59 by means of screws 62 which may be threaded into apertures 63provided in the frame.

Depending from one of the grid or web members 44 is a boss 64 which isprovided with a threaded aperture 65 entered by a screw 66. A sheetmetal closure-plate 61. provided with an indented portion 68, is adaptedto be secured to the grid-member 44 by a nut 66' threaded upon the screw66; said screw 66 passing through an aperture 10 in said indentedportion 68 and being accessible through an opening 69 in theplatformmember 35. An oil-absorbent pad H is provided on theclosure-plate 61 for the purpose of functioning as an oil seal andsound-absorbing means disposed between the platform member 35 and theclosure-plate 61.

Projecting upwardly from the frame 4| isan arm 12 formed with a channel13 in which is slidably disposed a rectangular shaped lug 14 providedupon the frame of the motor 2|. The

lug I4 is adjustably fixed to the arm 12 by means of a screw whichextends through a vertically elongated slot 16 in the arm II and isthreaded into the lug 14. From the above it will be obvious that themotor 2| may be raised or lowered upon its supp rt.

The end-wall 30 is provided with an opening 11 for receiving anelectrical terminal 18, and the side-wall 29 and the cloth-plate 21 areshaped to form a recess for the reception of the motor 2|.

The throat-plate 6| overhangs a recess 19 in the end-wall 3| so as tosupport the work above the loop-taker 54. The end-wall 3| has aperturedears 86 to receive screws 8| which pivotally support a sheet metalextension-plate 82. As shown in Fig. 3, the extension-plate. when in itslowered position, abuts the edges of the throat-plate 6| and cloth-plate21. Fig. 1 shows the extensionplate 82 in a partially raised position.

Having thus set forth the nature of the invention what I claim hereinis:

1. In a sewing machine having sewing instru mentalities including areciprocatory needle and a complemental loop-taker, a loop-taker shaft,work-feeding means including feed-actuating shafts, a bed comprising acloth-plate, sideand end-walls depending from said cloth-plate andforming therewith a unitary and chambered receptable; a, closure-platedetachably disposed at the underside of said receptacle; and a rigidframe member carried within said receptacle and having bearing portionsthereon, said bearin portions being secured to said end-walls, saidfeed-actuating shafts being mounted in said bearing portions, sa-idloop-taker shaft being carried by said frame member, and a grid carriedby said frame member and engaging said cloth-plate in a plurality ofspaced areas.

2. In a sewing machine having sewing instrumentalities including areciprocatory needle and a complemental loop-taker, a loop-taker shaft,work-feeding means, including feed-actuating shafts; a bed comprising asheet-metal clothplate, sheet-metal side and end-walls depending fromsaid cloth-plate and forming therewith a unitary and chamberedreceptacle; a sheetmetal platform member to which said sideand end-wallsare secured, said platform member having an opening therein; aclosure-plate detachably positioned over said opening; and a unitary andrigid frame member carried entirely within said receptacle, bearingelements carried by said frame member and secured to said endwalls, saidfeed-actuating shafts being mounted within said bearing elements, saidloop-taker shaft being carried by said frame member, and a grid carriedby said frame member and engaging the lower side of said sheet-metalcloth-plate in aplurality of spaced areas.

3. In a sewing machine having sewin instrumentalities including areciprocatory needle and a complemental loop-taker, a loop-taker shaft,work-feeding means including a feed shaft, and an electric motor toactuate said shafts; a bed comprising a cloth-plate having a pluralityof openings therein, and sideand end-walls depending from saidcloth-plate and forming therewith a unitary and chambered receptacle,said end-walls having a plurality of apertures therein; a closure-platedetachably positioned on the underside of said receptacle; a rigid andunitary frame member carried within said receptacle, said frame memberincluding a plurality of bearing bosses which extend into the aperturesprovided in said end-walls, said bearing bosses being adapted to carrysaid feed shaft, a grid ele-' ment extending from said frame andengaging the bottom portion of said cloth-plate in a plurality of areas,and an arm carried by said frame and supporting said electric motor; anda throatplate secured directly to said frame and extending through oneof said cloth-plate openings; said loop-taker shaft being mounted withinsaid frame and having one of its ends extending through one of theapertures provided in one of said end-walls, said loop-taker being fixedto the end of the shaft extending beyond said endwall.

4. A sewing machine having an upright standard, a unitary bed-frameconsisting of a plurality of interengaging web-elements forming a flatgrid, a loop-taker shaft, work-feeding means, said loop-taker shaft andsaid work-feeding means being carried by and mounted within saidbed-frame, a cloth-plate having wall portions depending downwardlytherefrom to form a chambered receptacle, said cloth-plate being mountedupon said grid and being clamped between said standard and saidbed-frame, and means provided on said bed-frame for securing the samedirectly to said wall portions at a plurality of spaced areas.

5. A sewing machine having a unitary bedframe consisting of a pluralityof interengaging web-elements forming a flat grid, a loop-taker shaft,work-feeding means, said loop-taker shaft and said work-feeding meansbeing carried by and mounted within said bed-frame, and a clothplatehaving a pair of side-walls depending downwardly therefrom, saidcloth-plate being mounted upon said grid, 9, pair of unitary endwallseach being secured upon an opposite end of said bed-frame, saidcloth-plate and said unitary end-walls forming a chambered receptaclecontaining said bed-frame, and a closure-plate detachably disposed atthe under side 01' said receptacle.

6. A bed for use with a sewing machine, said bed comprising a sheetmetal cloth-plate provided with downwardly depending walls forming aunitary and chambered receptacle, a unitary sheet metal platform memberto which said walls are secured, said platform member having an openingtherein, a closure-plate detachably positioned over the opening providedin said platform member, and a unitary skeleton frame member carriedwithin said chambered receptacle, said skeleton frame member consistingof a plurality of interlocking webs which engage th under side of saidcloth-plate and said depending walls in a plurality of spaced areas.

7. A sewing machine having an upright standard, a unitary bed-frameconsisting of a plurality of interengaging web-elements forming a flatgrid, a loop-taker shaft, work-feeding means, said loop-taker shaft andwork-feeding means being carried by and mounted within said bedframe, acloth-plate provided with downwardly depending walls forming a unitaryand chambered receptacle, a unitary platform member to which said wallsare secured, said platform member having an opening therein, aclosure-plate -detachably positioned over the opening provided in saidplatform member, said cloth-plate being mounted upon said fiat grid andbeing clamped between said standard and said bed-frame so that saidinterengaging webs engage the under side of said cloth-plate, and meansprovided on said bed-frame for securing the same directly to said wallsat a plurality of spaced areas.

81' A sewing machine having a unitary bedframe consisting of a pluralityof interengaging web-elements forming a flat grid, a cloth-plate havinga pair of opposed side-walls depending downwardly therefrom, saidcloth-plate being mounted upon said grid, a pair of unitary endwallseach being secured upon an opposite end portion of said bed-frame, saidcloth-plate and said end-walls forming a chambered receptacle containingsaid bed-frame, a closure-plate detachably disposed at the under side ofsaid receptacle, one of said end-walls having a portion thereofapertured and inwardly offset to provide an apertured recess, aloop-taker shaft mounted within said bed-frame and having one of itsends extending outwardly through said apertured recess, and a loop-takerpositioned within said sidewall recess and being fixed upon the endportion of said shaft extending beyond said end-wall.

DANIEL H. CHASON.

